| =pod |
| |
| =head1 NAME |
| |
| Ed25519, |
| Ed448 |
| - EVP_PKEY Ed25519 and Ed448 support |
| |
| =head1 DESCRIPTION |
| |
| The B<Ed25519> and B<Ed448> EVP_PKEY implementation supports key generation, |
| one-shot digest sign and digest verify using PureEdDSA and B<Ed25519> or B<Ed448> |
| (see RFC8032). It has associated private and public key formats compatible with |
| RFC 8410. |
| |
| No additional parameters can be set during key generation, one-shot signing or |
| verification. In particular, because PureEdDSA is used, a digest must B<NOT> be |
| specified when signing or verifying. |
| |
| =head1 NOTES |
| |
| The PureEdDSA algorithm does not support the streaming mechanism |
| of other signature algorithms using, for example, EVP_DigestUpdate(). |
| The message to sign or verify must be passed using the one-shot |
| EVP_DigestSign() and EVP_DigestVerify() functions. |
| |
| When calling EVP_DigestSignInit() or EVP_DigestVerifyInit(), the |
| digest B<type> parameter B<MUST> be set to B<NULL>. |
| |
| Applications wishing to sign certificates (or other structures such as |
| CRLs or certificate requests) using Ed25519 or Ed448 can either use X509_sign() |
| or X509_sign_ctx() in the usual way. |
| |
| A context for the B<Ed25519> algorithm can be obtained by calling: |
| |
| EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_ED25519, NULL); |
| |
| For the B<Ed448> algorithm a context can be obtained by calling: |
| |
| EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_ED448, NULL); |
| |
| Ed25519 or Ed448 private keys can be set directly using |
| L<EVP_PKEY_new_raw_private_key(3)> or loaded from a PKCS#8 private key file |
| using L<PEM_read_bio_PrivateKey(3)> (or similar function). Completely new keys |
| can also be generated (see the example below). Setting a private key also sets |
| the associated public key. |
| |
| Ed25519 or Ed448 public keys can be set directly using |
| L<EVP_PKEY_new_raw_public_key(3)> or loaded from a SubjectPublicKeyInfo |
| structure in a PEM file using L<PEM_read_bio_PUBKEY(3)> (or similar function). |
| |
| Ed25519 and Ed448 can be tested within L<speed(1)> application since version 1.1.1. |
| Valid algorithm names are B<ed25519>, B<ed448> and B<eddsa>. If B<eddsa> is |
| specified, then both Ed25519 and Ed448 are benchmarked. |
| |
| =head1 EXAMPLES |
| |
| This example generates an B<ED25519> private key and writes it to standard |
| output in PEM format: |
| |
| #include <openssl/evp.h> |
| #include <openssl/pem.h> |
| ... |
| EVP_PKEY *pkey = NULL; |
| EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_ED25519, NULL); |
| EVP_PKEY_keygen_init(pctx); |
| EVP_PKEY_keygen(pctx, &pkey); |
| EVP_PKEY_CTX_free(pctx); |
| PEM_write_PrivateKey(stdout, pkey, NULL, NULL, 0, NULL, NULL); |
| |
| =head1 SEE ALSO |
| |
| L<EVP_PKEY_CTX_new(3)>, |
| L<EVP_PKEY_keygen(3)>, |
| L<EVP_DigestSignInit(3)>, |
| L<EVP_DigestVerifyInit(3)>, |
| |
| =head1 COPYRIGHT |
| |
| Copyright 2017-2020 The OpenSSL Project Authors. All Rights Reserved. |
| |
| Licensed under the OpenSSL license (the "License"). You may not use |
| this file except in compliance with the License. You can obtain a copy |
| in the file LICENSE in the source distribution or at |
| L<https://www.openssl.org/source/license.html>. |
| |
| =cut |
